236 lines
7.6 KiB
C
236 lines
7.6 KiB
C
/*
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$Id: read.c,v 1.4 2005/02/05 04:25:14 rocky Exp $
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Copyright (C) 2005 Rocky Bernstein <rocky@panix.com>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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/** \file read.h
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*
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* \brief sector (block, frame)-related libcdio routines.
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*/
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#include <cdio/cdio.h>
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#include <cdio/logging.h>
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#include "cdio_private.h"
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#include "cdio_assert.h"
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#ifdef HAVE_STRING_H
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#include <string.h>
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#endif
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#define check_read_parms(p_cdio, p_buf, i_lsn) \
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if (!p_cdio) return DRIVER_OP_UNINIT; \
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if (!p_buf || CDIO_INVALID_LSN == i_lsn) \
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return DRIVER_OP_ERROR;
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#define check_lsn(i_lsn) \
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check_read_parms(p_cdio, p_buf, i_lsn); \
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{ \
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lsn_t end_lsn = \
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cdio_get_track_lsn(p_cdio, CDIO_CDROM_LEADOUT_TRACK); \
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if ( i_lsn > end_lsn ) { \
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cdio_info("Trying to access past end of disk lsn: %ld, end lsn: %ld", \
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(long int) i_lsn, (long int) end_lsn); \
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return DRIVER_OP_ERROR; \
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} \
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}
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#define check_lsn_blocks(i_lsn, i_blocks) \
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check_read_parms(p_cdio, p_buf, i_lsn); \
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{ \
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lsn_t end_lsn = \
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cdio_get_track_lsn(p_cdio, CDIO_CDROM_LEADOUT_TRACK); \
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if ( i_lsn > end_lsn ) { \
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cdio_info("Trying to access past end of disk lsn: %ld, end lsn: %ld", \
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(long int) i_lsn, (long int) end_lsn); \
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return DRIVER_OP_ERROR; \
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} \
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if ( i_lsn + i_blocks -1 > end_lsn ) { \
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cdio_info("Request truncated to end disk; lsn: %ld, end lsn: %ld", \
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(long int) i_lsn, (long int) end_lsn); \
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i_blocks = end_lsn - i_lsn + 1; \
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} \
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}
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/*!
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lseek - reposition read/write file offset
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Returns (off_t) -1 on error.
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Similar to (if not the same as) libc's lseek()
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*/
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off_t
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cdio_lseek (const CdIo_t *p_cdio, off_t offset, int whence)
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{
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if (!p_cdio) return DRIVER_OP_UNINIT;
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if (p_cdio->op.lseek)
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return p_cdio->op.lseek (p_cdio->env, offset, whence);
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return DRIVER_OP_UNSUPPORTED;
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}
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/*!
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Reads into buf the next size bytes.
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Returns -1 on error.
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Similar to (if not the same as) libc's read()
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*/
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ssize_t
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cdio_read (const CdIo_t *p_cdio, void *p_buf, size_t size)
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{
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if (!p_cdio) return DRIVER_OP_UNINIT;
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if (p_cdio->op.read)
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return p_cdio->op.read (p_cdio->env, p_buf, size);
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return DRIVER_OP_UNSUPPORTED;
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}
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/*!
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Reads an audio sector from cd device into data starting
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from lsn. Returns DRIVER_OP_SUCCESS if no error.
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*/
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driver_return_code_t
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cdio_read_audio_sector (const CdIo_t *p_cdio, void *p_buf, lsn_t i_lsn)
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{
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check_lsn(i_lsn);
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if (p_cdio->op.read_audio_sectors != NULL)
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return p_cdio->op.read_audio_sectors (p_cdio->env, p_buf, i_lsn, 1);
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return DRIVER_OP_UNSUPPORTED;
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}
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/*!
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Reads audio sectors from cd device into data starting
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from lsn. Returns DRIVER_OP_SUCCESS if no error.
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*/
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driver_return_code_t
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cdio_read_audio_sectors (const CdIo_t *p_cdio, void *p_buf, lsn_t i_lsn,
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unsigned int i_blocks)
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{
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check_lsn_blocks(i_lsn, i_blocks);
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if (p_cdio->op.read_audio_sectors != NULL)
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return p_cdio->op.read_audio_sectors (p_cdio->env, p_buf, i_lsn, i_blocks);
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return DRIVER_OP_UNSUPPORTED;
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}
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#ifndef SEEK_SET
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#define SEEK_SET 0
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#endif
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/*!
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Reads a single mode1 form1 or form2 sector from cd device
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into data starting from lsn. Returns DRIVER_OP_SUCCESS if no error.
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*/
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driver_return_code_t
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cdio_read_mode1_sector (const CdIo_t *p_cdio, void *p_buf, lsn_t i_lsn,
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bool b_form2)
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{
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uint32_t size = b_form2 ? M2RAW_SECTOR_SIZE : CDIO_CD_FRAMESIZE ;
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check_lsn(i_lsn);
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if (p_cdio->op.read_mode1_sector) {
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return p_cdio->op.read_mode1_sector(p_cdio->env, p_buf, i_lsn, b_form2);
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} else if (p_cdio->op.lseek && p_cdio->op.read) {
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char buf[CDIO_CD_FRAMESIZE] = { 0, };
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if (0 > cdio_lseek(p_cdio, CDIO_CD_FRAMESIZE*i_lsn, SEEK_SET))
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return -1;
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if (0 > cdio_read(p_cdio, buf, CDIO_CD_FRAMESIZE))
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return -1;
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memcpy (p_buf, buf, size);
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return DRIVER_OP_SUCCESS;
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}
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return DRIVER_OP_UNSUPPORTED;
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}
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/*!
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Reads mode 1 sectors
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@param p_cdio object to read from
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@param buf place to read data into
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@param lsn sector to read
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@param b_form2 true for reading mode 1 form 2 sectors or false for
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mode 1 form 1 sectors.
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@param i_sectors number of sectors to read
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*/
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driver_return_code_t
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cdio_read_mode1_sectors (const CdIo_t *p_cdio, void *p_buf, lsn_t i_lsn,
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bool b_form2, unsigned int i_blocks)
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{
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check_lsn_blocks(i_lsn, i_blocks);
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if (p_cdio->op.read_mode1_sectors)
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return p_cdio->op.read_mode1_sectors (p_cdio->env, p_buf, i_lsn, b_form2,
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i_blocks);
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return DRIVER_OP_UNSUPPORTED;
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}
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/*!
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Reads a mode 2 sector
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@param p_cdio object to read from
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@param buf place to read data into
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@param lsn sector to read
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@param b_form2 true for reading mode 2 form 2 sectors or false for
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mode 2 form 1 sectors.
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*/
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driver_return_code_t
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cdio_read_mode2_sector (const CdIo_t *p_cdio, void *p_buf, lsn_t i_lsn,
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bool b_form2)
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{
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check_lsn(i_lsn);
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if (p_cdio->op.read_mode2_sector)
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return p_cdio->op.read_mode2_sector (p_cdio->env, p_buf, i_lsn, b_form2);
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/* fallback */
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if (p_cdio->op.read_mode2_sectors != NULL)
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return cdio_read_mode2_sectors (p_cdio, p_buf, i_lsn, b_form2, 1);
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return DRIVER_OP_UNSUPPORTED;
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}
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/*!
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Reads mode 2 sectors
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@param p_cdio object to read from
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@param buf place to read data into
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@param lsn sector to read
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@param b_form2 true for reading mode2 form 2 sectors or false for
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mode 2 form 1 sectors.
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@param i_sectors number of sectors to read
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*/
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driver_return_code_t
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cdio_read_mode2_sectors (const CdIo_t *p_cdio, void *p_buf, lsn_t i_lsn,
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bool b_form2, unsigned int i_blocks)
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{
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check_lsn_blocks(i_lsn, i_blocks);
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if (p_cdio->op.read_mode2_sectors)
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return p_cdio->op.read_mode2_sectors (p_cdio->env, p_buf, i_lsn,
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b_form2, i_blocks);
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return DRIVER_OP_UNSUPPORTED;
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}
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/*
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* Local variables:
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* c-file-style: "gnu"
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* tab-width: 8
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* indent-tabs-mode: nil
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* End:
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*/
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